Apparatus for supplying air to steam-generator furnaces.



No; 69l, 679. Patented Jar l. 21,1902.

6. VOET.

APPARATUS FOR ISUPPLYING-AIB T0 STEAM GENERATOR FURNACES.

(Application filed Apr. 9, 1 901.) t

(No Model.)

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i? ATENT OFFICE.

CORNELIUS VOET, OE HARLEM, NETHERLANDS.

APPARATUS FOR SUPPLYING ME TO STEAM-GENERATOR FURNACES.

SPECIFICATION forming part of Letters Patent No. 691,679, dated January 21, 1902.

Application filed April 9, 1901.

' To aZZ whom it may concern.-

Be itknown that LOORNELIUs VOET, asubject of the Qneen of the Netherlands, residing at Harlem, Netherlands, have invented a certain new and useful Improved Apparatus for Supplying Air to'Steam-Generator Furnaces, (for which application for Letters Patent has been made in Great Britain under No.

1,786, dated January 25, 1901; in Germany,

dated January 25, 1901; in France under Serial No. 295,943, dated January 26, 1901,and in Belgium under Serial No. 123,197, dated March 15, 1901,) of which the following is a specification.

The present invention relates to an improved apparatus for supplying the furnaces of boilers with the air necessary for combustion and to apparatus therefor. In the ordinary way such supply of air is obtained either by artificial draft or bya blower or blast device. In the case of artificial draft the air is drawn by the chimney through the grate and the fire-tubes, while in cases where blast is used the air is forced through the grate at a pressure in excess of that of the surrounding air. This excess pressure is produced in all known cases by means of a blower or blast device.

The object of the present invention relates to an arrangement whereby such excess pressure is produced by the outer air itself, the air being received and pressed by the pressure of the outside air or current into air-collecting heads communicating through pipes with the space under the grate, into which the air rushes with the excess pressure thus acquired.

In the accompanying drawings an arrangement in connection with a marine boiler is represented by way of example wherein the compressed air is used in this manner.

Figure 1 represents a front view of a furnaceg Fig. 2, a part longitudinal section and Fig. 3 a cross-sectionthrough the box.

In front of the ash-pit a of the boiler 19 is arranged an air-tight box b,with an obliquelydirectedfront. With this boxb communicate pipes c and cl, rising above the upper deck,where they end in air-collecting heads f, Fig. 1. These air-collecting heads fare rotatorily arranged in the known manner and are Serial No. ,0'74. (No model.)

always placed against the wind, so as to offer a passage to the latter, as indicated by the arrows. Through the pipes c and d the outer air is led below the grate g and passes,- driven by the pressure thus acquired,through the fuel. For the purpose of regulating such pressure there are arranged slides h, provided in the pipes, which can be actuated by means of levers j and set according to an indicator 2'. When it is required to work with natural draft, the levers j are placed in the position represented in Fig. 1, in which position the slides it fully close the air-passages, while doors or the like and 1, provided for that purpose on the air-chest b, are opened for the purpose of admitting the air. The door Z may also be used for cleaning out the ash-pit. In order to economize space, the pipes c and cl are arranged along the smokebox e, one of the pipes being shown as passing through and the other located outside the smoke-box, though this arrangement is not essential. In 'the first ease the air passes through a process of preliminary heating before it reaches the fire,'an arrangement which greatly assists combustion. During the voyage the air-collecting heads are turned forward, while when the vessel is at anchor the heads are directed against the wind. Even in the latter case the air will reach the fire with a sufficient amount of pressure, In the case of stationary steam -generators the arrangement is the same. For the purpose of preliminarily heating the air it is preferable to arrange the supply-pipes c and d laterally along the boiler in the fire-passages. The aircollecting heads for stationary boilers may also beprovided with a device whereby they will place themselves automatically against the wind. This arrangement is also applica ble with very satisfactory results in the case of locomotives, where the great speed of mo= tion is calculated to produce a very high blast pressure. The preliminaryheating of the air may also be applied with very great success in the case of locomotives. What I claim as my invention, and desire to secure by Letters Patent, is-

1. A blast device for steam-boilers comprising upwardlyextending air collecting pipes provided with movable heads and 10 of said chamber, dampers in said pipes, ro-

valves, achamberb communicating with said i tary heads for the latter, and a smoke-box pipes and with the space below the furnacel through which one of said pipes passes.

grate, and upper and lower doors upon said In testimony whereof I have signed my chamber, substantially as described. name to this specification in the presence of 2. A blast device for steam-boilers includtwo subscribing witnesses.

ing, a furnace having an ash-pit, a chamber communicating with said ash-pit and having CORNELIUS VOET' an obliquely-disposed upper Wall, a plurality of air-supply pipes leading into opposite sides Witnesses:

THOMAS HERMANNS VERHAVE, AUGUST SIEGFRIED DOCEN. 

